Author: Ribeiro, F.
Paper Title Page
TUPOMS005 SOLEIL Machine Status and Upgrade 1397
 
  • L.S. Nadolski, G. Abeillé, Y.-M. Abiven, F. Bouvet, P. Brunelle, N. Béchu, M.-E. Couprie, X. Delétoille, S. Duigou, A. Gamelin, C. Herbeaux, N. Hubert, M. Labat, J.-F. Lamarre, V. Le Roux, A. Lestrade, A. Loulergue, O. Marcouillé, F. Marteau, A. Nadji, R. Nagaoka, M. Nouna, Y. Rahier, F. Ribeiro, G. Schaguene, K. Tavakoli, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette, France
  • S. Ducourtieux
    LNE, Trappes Cedex, France
 
  SOLEIL is both a 2.75 GeV third generation synchrotron light source and a research laboratory at the forefront of experimental techniques dedicated to matter analysis down to the atomic scale, as well as a service platform open to all scientific and industrial communities. We present the performance of the accelerators delivering extremely stable photon beams to 29 beamlines. We report on the commissioning of a superbend magnet replacing a standard 1.71T dipole with a 2.84 T narrow peak permanent magnet-based dipole. It required local modification of the lattice to compensate linear and nonlinear optics distortions introduced by the new magnet field. The latest measurements made with a Multipole Injection Kicker are also reported. Work on the NEG test bench and its dedicated front-end for a 10 mm inner diameter vacuum pipe and other major R&D areas are also addressed in the frame of the SOLEIL upgrade.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS005  
About • Received ※ 10 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 30 June 2022
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TUPOMS040 Characterization of Higher-Order-Modes (HOM) in THOMX Storage Ring RF Cavity 1513
 
  • M. El Khaldi, J-N. Cayla, H. Monard
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • M. Diop, F. Ribeiro
    SOLEIL, Gif-sur-Yvette, France
 
  The RF system of the ThomX storage ring consists in a 500 MHz single cell copper cavity of the ELETTRA type, powered with a 50 kW CW solid state amplifier, and the associated Low-Level RF feedback and control loops. The low operating energy of 50-100 MeV makes the impedances of the cavity higher order modes (HOMs) particularly critical for the beam stability. Their parasitic effects on the beam can be cured by HOM frequency shifting techniques, based on a fine temperature tuning and a dedicated adjustable plunger. A cavity temperature stability of ± 0.1 °C within a range from 30 up to 70 °C is achieved by a precise control of its water-cooling temperature. On the other hand, the tuning of the cavity fundamental mode is achieved by changing its axial length by means of a mechanical tuner. In order to insure a fine control of the HOM frequencies, a good knowledge of their characteristics is mandatory. The main parameters of the fundamental and of the HOMs up to 2.2 GHz versus temperature have been measured at low power using a vector network analyzer (VNA).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOMS040  
About • Received ※ 03 June 2022 — Revised ※ 10 June 2022 — Accepted ※ 12 June 2022 — Issue date ※ 21 June 2022
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